- The book: https://doc.rust-lang.org/book/second-edition/index.html
- Rust By Example is also good but it may currently be out of date (folks are working to improve it)
Paid:
- The O'Reilly book by Jim Blandy and Jason Orendorff
- integer32 in the US has done paid trainings in the past
- Asquera in Germany does trainings too (the content is https://skade.github.io/rust-three-days-course/presentation/... )